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authorLudovic Courtès <ludo@gnu.org>2013-04-14 16:56:08 +0200
committerLudovic Courtès <ludo@gnu.org>2013-04-14 16:56:08 +0200
commit04fd96cac33fa7557e574e54575252564ba27111 (patch)
tree42f0ca2251cf6effb82b9d38f7789e2ad54842a8 /tests
parent77ffd691bfbb152cde94b60aa8df5135d39727c3 (diff)
downloadguix-04fd96cac33fa7557e574e54575252564ba27111.tar
guix-04fd96cac33fa7557e574e54575252564ba27111.tar.gz
utils: Add `fold2'.
* gnu/packages.scm (fold2): Remove. * guix/utils.scm (fold2): New procedure. Generalization of the above to one and two lists. * tests/utils.scm ("fold2, 1 list", "fold2, 2 lists"): New tests.
Diffstat (limited to 'tests')
-rw-r--r--tests/utils.scm25
1 files changed, 25 insertions, 0 deletions
diff --git a/tests/utils.scm b/tests/utils.scm
index bcdd120a74..fa7d7b03fd 100644
--- a/tests/utils.scm
+++ b/tests/utils.scm
@@ -64,6 +64,31 @@
("nixpkgs" "1.0pre22125_a28fe19")
("gtk2" "2.38.0"))))
+(test-equal "fold2, 1 list"
+ (list (reverse (iota 5))
+ (map - (reverse (iota 5))))
+ (call-with-values
+ (lambda ()
+ (fold2 (lambda (i r1 r2)
+ (values (cons i r1)
+ (cons (- i) r2)))
+ '() '()
+ (iota 5)))
+ list))
+
+(test-equal "fold2, 2 lists"
+ (list (reverse '((a . 0) (b . 1) (c . 2) (d . 3)))
+ (reverse '((a . 0) (b . -1) (c . -2) (d . -3))))
+ (call-with-values
+ (lambda ()
+ (fold2 (lambda (k v r1 r2)
+ (values (alist-cons k v r1)
+ (alist-cons k (- v) r2)))
+ '() '()
+ '(a b c d)
+ '(0 1 2 3)))
+ list))
+
(test-assert "define-record-type*"
(begin
(define-record-type* <foo> foo make-foo